Automatic Induction Sealing Machine for PET Bottles
The SUNAURA benchtop automatic induction sealer delivers true continuous non-contact foil sealing at up to 10 m/min on a single worktop footprint. Built for small-batch PET bottle lines — essential oils, e-liquids, oral liquids, and small vials — with a 1500W air-cooled power stage and integrated conveyor. CE-certified and factory-direct.
Product Description
The SUNAURA automatic induction sealing machine for PET bottles is a compact, economical benchtop continuous induction sealer designed specifically for small-scale and start-up packaging operations. The entire sealing unit and conveyor sit on a single worktop footprint — about the size of a small office printer — so it drops onto a standard packing bench without a dedicated floor-standing frame. The cabinet is painted cold-rolled steel with a stainless-steel work surface, and the high-frequency output stage uses a transistor-based control circuit for stable, consistent power across long shifts.
Its 1500W generator handles sealing diameters from Φ20 to Φ50mm and bottle heights from 40 to 200mm at conveyor speeds up to 10 m/min. Air cooling means no water hookup, no chiller, and no drain — just plug it in, set the power and speed dials, and start sealing. This is the sweet spot for essential oil brands, e-liquid producers, oral liquid manufacturers, and cosmetic serum bottlers who need a professional tamper-evident seal without investing in a full inline line.
Every unit undergoes a 48-hour continuous run test before shipment and ships CE certified. Our engineering team can run sample seals on your own bottles and foil liners before you place the order — just send a carton of empties to our Qingdao factory.
Technical Specifications
| Model | SNA-B1500 Benchtop PET Bottle Induction Sealer |
|---|---|
| Sealing Method | Electromagnetic induction, non-contact continuous |
| Sealing Diameter | Φ20 – 50 mm |
| Conveyor Speed | 0 – 10 m/min, continuously adjustable |
| Max Bottle Height | 40 – 200 mm (head height adjustable) |
| Power | 1500 W |
| Voltage | 110 / 220 V, 50 / 60 Hz (factory-set to order) |
| Cooling System | Air-cooled (no water connection required) |
| Conveyor | Integrated benchtop belt conveyor |
| Machine Dimensions | 1150 × 480 × 400 mm (L × W × H) |
| Net Weight | Approx. 38 kg |
| Certification | CE Certified, ISO 9001 factory |
Key Features & Benefits
- True continuous non-contact sealing: Bottles move along the belt beneath the RF head — no physical touch, no cap wear, consistent seal repeat after repeat.
- Compact tabletop footprint: The entire sealer + conveyor fits on one worktop, taking roughly 1.15 m of bench length. Ideal for labs, co-packers, and start-up operations with limited floor space.
- Adjustable conveyor speed and sealing power: Two independent dials let you fine-tune dwell time and RF energy for different foil liner thicknesses and cap sizes.
- Air-cooled, no water hookup: Integrated fan cooling eliminates the need for a chiller, water supply, or drain. Plug in and operate — lower installation cost and fewer maintenance points.
- Automatic over-current and over-temperature protection: The transistor control circuit monitors power stage temperature and shuts down safely if limits are exceeded, protecting the generator from thermal damage.
- CE-compliant construction: Painted cold-rolled steel cabinet with stainless steel work surface, shielded RF head, and emergency stop — meets European EMC and safety requirements.
- Fast payback for small-batch packers: Entry-level price point with no recurring consumables beyond foil liners. Most customers recover the investment within a single production quarter.
Application Industries
Pharmaceutical Vials
Oral liquids, antibiotic suspensions, and small medicine vials — tamper-evident foil seals support GMP and traceability requirements.
Essential Oils & Aromatherapy
5–100 ml PET dropper bottles — hermetic foil seal prevents evaporation, oxidation, and leakage during shipping.
E-Liquids & Vaping
Nicotine salt and freebase e-juice bottles — child-resistant caps with induction liners meet regional packaging regulations.
Cosmetics & Serums
Serums, toners, essences, and ampoules in PET or small glass — protects sensitive formulations from moisture and contamination.
Food & Sauces
Small-batch hot sauces, dressings, and flavor extracts in PET bottles — prevents leakage and extends shelf life.
Chemical & Lab Reagents
Small bottles of reagents, solvents, and additives — leak-proof seal protects workers and prevents cross-contamination.
Container compatibility: PET, HDPE, PP, and glass bottles with mouth diameters from 20 to 50 mm. Not suitable for metal containers or metal caps.
How Induction Sealing Works
Induction bonding is a non-contact process that fuses an aluminum foil liner to the container mouth using electromagnetic energy. On this benchtop machine, the cycle happens as the bottle travels under the sealing head on the conveyor belt:
- Capped PET bottle enters under the sealing head. The cap, pre-lined with a foil-backed disc (aluminum foil + wax layer + pulp board + heat-seal film), travels along the benchtop conveyor beneath the RF coil head.
- High-frequency field induces current in the foil. The transistor generator produces a 20–100 kHz alternating magnetic field that passes through the plastic cap and induces eddy currents directly in the aluminum foil layer.
- Foil heats — wax melts, polymer film bonds to rim. Resistive heating in the foil raises its temperature almost instantly. The wax layer melts and absorbs into the pulp board (staying inside the cap), while the heat-seal film on the underside of the foil melts and fuses to the PET bottle rim.
- Cap unscrewed — foil seal remains. When the end user twists off the cap, the pulp liner stays captured inside the cap, leaving the aluminum foil disc bonded to the bottle mouth as a visible, tamper-evident, hermetic seal.
- Bottles exit on the same belt. Sealed bottles continue along the conveyor to labeling or packaging — no cooling station required, since the plastic neck never gets hot enough to deform.
Is This the Right Benchtop Sealer for You?
This model is the right fit if your operation matches all four of the following. If you fall outside any of them, our team can recommend a different SUNAURA model:
- Cap diameter between Φ20 and Φ50 mm: This head covers small to medium necks — typical of essential oil droppers, e-liquid bottles, oral liquid vials, and serum bottles. If your caps are wider (e.g., wide-mouth cosmetic jars over 60 mm), look at our inline models instead.
- Throughput under roughly 100–150 bottles/min: At 10 m/min conveyor speed with 30 mm caps, expect around 80–120 bottles per minute. If you need 200+ BPM, step up to a floor-standing 2000W or 2300W model.
- Benchtop or single-operator production: One operator places capped bottles on the left end of the belt and collects sealed bottles on the right. No line integration needed — ideal for batch work, contract packing, and R&D labs.
- Ambient, indoor use with no water supply required: Air-cooled operation means no chiller, no water lines. If you run 24/7 shifts or need to seal large-diameter caps continuously, consider a water-cooled high-power model instead.
Troubleshooting Guide — Common Issues & Solutions
Benchtop induction sealers are robust, but small-batch operators occasionally hit seal quality or setup issues. Below are the most common problems we diagnose remotely, their likely causes, and fixes. Always disconnect power before inspecting the sealing head.
| Problem | Possible Causes | Solutions |
|---|---|---|
| Weak or incomplete seal on PET bottles | Conveyor speed too fast for the cap size; sealing head gap too large; power dial set too low; foil liner thickness mismatched. |
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| Foil not heating at all | No RF output; sealing head cable loose; non-induction foil loaded; cap not passing under center of head. |
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| Foil seal off-center on bottle mouth | Side guides crooked; bottle tracking off; cap not centered on bottle neck. |
|
| Over-temperature alarm triggers mid-batch | Continuous run too long for duty cycle; fan vents blocked; ambient room temperature over 40°C. |
|
| Bottles tip over or jam on belt | Bottle height exceeds 200 mm max; side guides too tight; conveyor speed too high for tall narrow bottles. |
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| Seal looks good but peels off easily | Foil liner bottom film not matched to PET; wet or greasy bottle neck; cap torque too low. |
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If the issue persists after trying these steps, email photos and a short 10-second video of the seal sample to [email protected] — our engineers usually diagnose the root cause within one business day.
Frequently Asked Questions
What bottle sizes can this PET bottle sealer handle?
The sealing head covers cap diameters from Φ20 to Φ50 mm and container heights from 40 to 200 mm. This covers most standard PET dropper bottles (10–60 ml), e-liquid chubby bottles, oral liquid vials, and small serum bottles. Send us your actual bottle dimensions and we will confirm before you order.
Do I need a water connection to run this machine?
No. This benchtop model is fully air-cooled with an integrated fan. There is no water inlet, no drain, and no chiller to maintain. Just plug into a standard 110V or 220V wall outlet and it runs. This is one reason it is popular in labs and small production rooms.
How many PET bottles per minute can it seal?
Conveyor speed is adjustable from 0 to 10 m/min. At a typical 30 mm cap spacing, expect roughly 80–120 bottles per minute. Exact output depends on cap diameter, bottle material, and how much dwell time your specific foil liner needs — we tune this on sample bottles before shipment.
Can I use it on glass bottles, or only PET?
It works on any non-metal container: PET, HDPE, PP, and glass all seal well. The key requirement is that the liner’s bottom film matches the container material. PET bottles need PET-formulated liners; glass bottles need glass-rated liners. We will recommend the correct liner type for your containers.
What is the warranty and how do I get support?
Every unit carries a 12-month warranty covering parts and labor, plus lifetime technical support by email and WhatsApp. Standard models ship in 7–15 days from Qingdao. Spare parts (sealing head, fan, control board) are dispatched worldwide within 48 hours via DHL or FedEx.
Why Buy From SUNAURA Machinery
48,000㎡ Own Factory
In-house manufacturing in Qingdao, China — no middlemen, no trader markup.
CE Certified
All machines meet European safety standards with full documentation.
ISO 9001:2015
Quality management system certified across the entire production process.
SGS Audited Factory
Third-party audited manufacturing facility with 20+ national patents.
12-Month Warranty
Full warranty covering parts and labor from the date of shipment.
Lifetime Support
Technical guidance via email, WhatsApp, and remote video for the machine’s life.
Spare Parts in 48h
Genuine parts shipped worldwide via DHL/FedEx within 48 hours.
100+ Countries Served
Trusted by packaging lines across food, pharma, cosmetics, and chemicals.
Get a Factory-Direct Quote in 24 Hours
Tell us your bottle size, cap diameter, and expected output — our engineers reply with a model recommendation, FOB price, and lead time within one business day. Every machine is built in our 48,000㎡ Qingdao factory, CE & ISO 9001 certified.
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